/Engine/Source/Editor/Experimental/EditorInteractiveToolsFramework/Public/EditorGizmos/TransformGizmo.h
Return true if input ray intersects current interaction plane and return param along ray in OutHitParam
virtual bool GetRayParamIntersectionWithInteractionPlane ( const [FInputDeviceRay](API\Runtime\InteractiveToolsFramework\FInputDeviceRay) & InRay, float & OutHitParam )